ZnCdSe/ZnS Core Shell Nanoparticles (Zinc Cadmium Selenium/Zinc Sulfide, 99.9%, APS: 80-100nm, Inorganic Semiconductor)

ZnCdSe/ZnS Core-Shell Nanoparticles

Applications

ZnCdSe/ZnS Core-Shell Nanoparticles are a type of core-shell nanomaterial composed of a zinc cadmium selenide (ZnCdSe) core and a zinc sulfide (ZnS) shell. These nanoparticles combine the advantages of both materials, resulting in unique optical, electronic, and chemical properties that are highly beneficial for a variety of nanotechnology and material science applications.

Structure and Composition

Core: Zinc Cadmium Selenide (ZnCdSe)

ZnCdSe is a ternary semiconductor composed of zinc (Zn), cadmium (Cd), and selenium (Se). This combination provides a material with semiconducting properties, particularly useful for optoelectronic applications.

The photoluminescent properties of ZnCdSe can be finely tuned by adjusting the relative concentrations of Zn and Cd, as well as by controlling the nanoparticle size. The Cd²⁺ ions incorporated into the lattice of ZnSe are responsible for the tunable emission that can range from green to red depending on the composition, making it highly desirable for applications in fluorescent imaging, biosensing, and lasers.

Shell: Zinc Sulfide (ZnS)

The ZnS shell serves multiple purposes, the most important of which is to passivate the surface of the nanoparticle and improve stability. ZnS is a wide-bandgap semiconductor with a high refractive index and low toxicity.

Properties

Tunable Photoluminescence:

The ZnCdSe core allows for tunable fluorescence across the visible spectrum (green, yellow, orange, red) depending on the ratio of Zn to Cd and the nanoparticle size. The ZnS shell helps to enhance the fluorescence, allowing for high quantum yields and narrow emission peaks.

This tunable fluorescence is ideal for multicolor fluorescence imaging, biosensing, and quantum dot applications, where specific wavelengths of light need to be emitted for detection or monitoring purposes.

High Quantum Yield:

The ZnS shell significantly improves the quantum yield of the ZnCdSe core, making these nanoparticles highly efficient at emitting light. This is a critical feature for applications such as bioimaging, where bright and efficient fluorescence is essential for clear and accurate imaging.

Photostability:

One of the key benefits of the ZnS shell is its ability to protect the ZnCdSe core from photo-oxidation and fluorescence quenching. This results in longer-lasting fluorescence and better performance over extended periods, even under prolonged exposure to light.